Filling knowledge gaps in Arctic marine biodiversity: Environment, plankton, and benthos of Franz Josef Land, Barents Sea

Ocean & Coastal Management, Journal Year: 2024, Volume and Issue: 249, P. 106987 - 106987

Published: Jan. 1, 2024

Language: Английский

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Impact of climate change on the distribution of Trachurus japonicus in the Northern South China Sea

Ecological Indicators, Journal Year: 2024, Volume and Issue: 160, P. 111758 - 111758

Published: Feb. 23, 2024

Understanding the impact of climate change on distribution marine species is vital importance for sustainable development fisheries. In this study, an ensemble model employed to predict potential Japanese jack mackerel (Trachurus japonicus) in Northern South China Sea (NSCS) under current conditions and three future scenarios (IPCC Representative Concentration Pathways RCP126, RCP245, RCP585). The incorporates environmental variables including sea surface salinity (SSS), height above geoid (SSH), temperature (SST), ocean mixed layer thickness (MLD), distance from land (DFL). Notably, SST SSH are found be most influential factors defining habitat T. japonicus. Model predictions reveal that suitable habitats japonicus primarily located offshore area west Pearl River estuary, especially waters with depths less than 100 m NSCS. Beibu Gulf emerges as a prominent species. However, projections indicate significant reduction areas high probability occurrence, particularly emissions. This observed NSCS at ranging 40 m, while northwestern coastal regions projected witness increase habitats. rate contraction expected surpass expansion, estimated 16.93 % 29.27 decrease by 2091–2100.These findings offer fundamental insights into how impacts provide valuable guidance resource utilization.

Language: Английский

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A multiple baseline approach for marine heatwaves

Limnology and Oceanography, Journal Year: 2024, Volume and Issue: 69(3), P. 638 - 651

Published: Feb. 7, 2024

Abstract Marine heatwaves and other extreme temperature events can drive biological responses, including mass mortality. However, their effects depend on how they are experienced by systems (including human societies). We applied two different baselines (fixed shifting) to a time series of North Sea water explore slowly vs. quickly adapting would experience temperatures. tested if the properties marine association with atmospheric were robust change in baseline. A fixed baseline produced an increase frequency duration heatwaves, which be as new normal systems; 7 10 most severe occurred between 1990 2018. The shifting removed trend but not heatwaves; 1990s appeared period strong compared 1980s. There also common patterns among baselines: more frequent late summer when temperatures peak; variability was characterized low frequency, large amplitude fluctuations (i.e., red noise), known extinction events. In addition, during or just after heatwaves. Our work highlights importance identifying that contingent

Language: Английский

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Potential effects of climate change on the growth response of the toxic dinoflagellate Karenia selliformis from Patagonian waters of Chile

Progress In Oceanography, Journal Year: 2023, Volume and Issue: 211, P. 102956 - 102956

Published: Jan. 9, 2023

Language: Английский

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Interaction matters: Bottom‐up driver interdependencies alter the projected response of phytoplankton communities to climate change

Global Change Biology, Journal Year: 2023, Volume and Issue: 29(15), P. 4234 - 4258

Published: June 2, 2023

Phytoplankton growth is controlled by multiple environmental drivers, which are all modified climate change. While numerous experimental studies identify interactive effects between large-scale ocean biogeochemistry models mostly account for responses to each driver separately and leave the results of these multiple-driver largely unused. Here, we amend phytoplankton functions in a biogeochemical model dual-driver interactions (CO2 temperature, CO2 light), based on data published meta-analysis laboratory experiments. The effect this parametrization biomass community composition tested using present-day future high-emission (SSP5-8.5) forcing. projected decrease total global simulations with similar that control without (5%-6%), group-specific. Globally, diatom decreases more compared simulation (-8.1% vs. no change interactions). Small-phytoplankton biomass, contrast, less on-going when accounts (-5.0% -9.0%). response coccolithophore conditions even reversed considered (+33.2% instead -10.8%). Regionally, largest difference detected Southern Ocean, where (-7.5%) increases (+14.5%), raising share small coccolithophores biomass. Hence, impact structure related fluxes ocean. Our approach first step integrate mechanistic understanding interacting gained experiments into model, aiming toward realistic projections composition.

Language: Английский

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River health assessment based on set pair analysis model in typical Northern Chinese City

Frontiers in Ecology and Evolution, Journal Year: 2025, Volume and Issue: 12

Published: Jan. 8, 2025

Rivers are critical to ecological and societal sustainability, yet human activities like urbanization, industrialization, agricultural runoff increasingly threaten their health. This study investigates the health of six major rivers in Dalian City, China, focusing on relationships between aquatic biological communities environmental factors. A total 168 phytoplankton species, 110 zooplankton 102 macrozoobenthos species were identified. The key factors influencing these included pH, dissolved oxygen, ammonium nitrogen, phosphorus, altitude. Using an entropy-weighted set pair analysis model, spatial variations river ecosystem evaluated. Monitoring sites S12 S15 exhibited good conditions, while S4, S8, S17 rated as poor (Grade IV), S7 was severely polluted V). Other showed borderline III). research provides valuable insights for improving management biodiversity conservation offering a scientific basis addressing water quality challenges.

Language: Английский

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John Raven, FRS, FRSE: a truly great innovator in plant physiology, photosynthesis and much more

Photosynthesis Research, Journal Year: 2025, Volume and Issue: 163(2)

Published: Feb. 17, 2025

This is a tribute to truly inspirational plant biologist, Prof. John A. Raven, FRS, FRSE (25th June 1941- 23rd May 2024), who died at the age of 82. He was leader in field evolution and physiology algae land plants. His research touched on many areas including photosynthesis, ion transport, carbon utilisation, mineral use, such as silicon, iron molybdenum, phytoplankton, root systems, impact global change, especially acidification oceans, gain water use early plants, ways detecting extraterrestrial photosynthesis. Beginning his career Botany School, University Cambridge, studied uptake giant algal cell. time great strides brought about by Peter Mitchell (1920-1992) elucidating role energy generation mitochondria chloroplasts coupling transport systems generation. With Enid MacRobbie Andrew Smith, pioneered work involvement growth metabolism cells.On leaving Cambridge took up lectureship Dundee 1971, where he still attached upon death. primary focus over years, with one us (Paul Falkowski), photosynthetic microalgae oceans. Still, publication list 5 books 600 scientific papers spans very broad range. The highly cited (see Table 1) attest an outstanding innovator, influenced multitude students coworkers wide readership worldwide. At personal level, Raven wonderful human being; had extraordinary memory, dredging facts little-known papers, like magician, but same making humorous jokes involving colleagues fun sympathetic appreciation. 1 Ten best articles (from google scholar) Citations Date Aquatic Photosynthesis, 3rd Edition P.G. Falkowski & J.A. Princeton Press, 2013 3854 modern eukaryotic phytoplankton Falkowski, M.E. Katz, A.H. Knoll, Quigg, et al Science 305, 354-360 1790 2004 CO2 concentrating mechanisms algae: mechanisms, environmental modulation, M. Giordano, J. Beardall Annu. Rev. Plant Biol. 56 (1), 99-131 1648 2005 Algae nutritional food sources: revisiting our understanding M.L. Wells, P. Potin, J.S. Craigie, S.S. Merchant, Journal applied phycology 29, 949-982 1527 2017 Nutrient acquisition strategies change soil H. Lambers, G.R. Shaver S.E. Smith Trends ecology 23, 95-103 1488 2008 Ocean due increasing atmospheric dioxide K. Caldeira, Elderfield, O. Hoegh-Guldberg, Liss, Royal Society, Policy Document, 1470 Phytoplankton changing world: cell size elemental stoichiometry Z.V. Finkel, Beardall, K.J. Flynn, T.A.V. Rees plankton 32, 119-137 1198 2010 Opportunities for improving phosphorus efficiency crop plants E.J. Veneklaas, Bragg, P.M. Finnegan, C.E. Lovelock, New phytologist 195, 306-320 951 2012 Adaptation unicellular irradiance: analysis Richardson, Phytologist 93, 157-191 914 1983 Nitrogen assimilation vascular relation Intracellular pH regulation F.A. 76, 415-431 893 1976 Temperature R.J. Geider 110, 441-461 867 1988 trace metals electron O2 -evolving organisms M.C.W. Evans R.E. Korb Photosynthesis Research 60, 111-150 840 1999.

Language: Английский

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Concurrent global change and marine heatwaves disturb phototrophic more than heterotrophic protist diversity

Limnology and Oceanography Letters, Journal Year: 2025, Volume and Issue: unknown

Published: April 17, 2025

Abstract Anthropogenic pressures like ocean warming, acidification, rising N : P ratios, and marine heatwaves (MHWs) are affecting eukaryotic plankton diversity, though their combined impacts rarely studied. To address this, we conducted a mesocosm experiment on North Sea community, testing the influence of MHW under ambient future environmental conditions. Using 18S rRNA amplicon sequencing, found that global change generally reduced protist in particular phototrophic organisms. While heterotrophs were largely unaffected by heatwaves, diversity declined especially during cooling only recovered Global shifted community from nano‐ to pico‐sized phototrophs increased harmful algae bloom species parasites, while elevated ochrophytes. The coccolithophore Gephyrocapsa oceanica thrived both stressors. Our findings suggest changing baseline conditions extreme events can differentially impact heterotrophic with potential consequences for metabolic balance communities.

Language: Английский

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Plastid-localized xanthorhodopsin increases diatom biomass and ecosystem productivity in iron-limited surface oceans

Nature Microbiology, Journal Year: 2023, Volume and Issue: 8(11), P. 2050 - 2066

Published: Oct. 16, 2023

Abstract Microbial rhodopsins are photoreceptor proteins that convert light into biological signals or energy. Proteins of the xanthorhodopsin family common in eukaryotic photosynthetic plankton including diatoms. However, their role these organisms remains elusive. Here we report on a variant ( Fc R1) isolated from polar diatom Fragilariopsis cylindrus . Applying combination biophysical, biochemical and reverse genetics approaches, demonstrate R1 is plastid-localized proton pump which binds chromophore retinal activated by green light. Enhanced growth Thalassiora pseudonana gain-of-function mutant expressing under iron limitation shows supports when chlorophyll-based photosynthesis iron-limited. The abundance transcripts natural communities surface oceans anticorrelated with availability dissolved iron. Thus, propose pumps convey fitness advantage regions where phytoplankton limited

Language: Английский

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Feeding in mixoplankton enhances phototrophy increasing bloom-induced pH changes with ocean acidification

Journal of Plankton Research, Journal Year: 2023, Volume and Issue: 45(4), P. 636 - 651

Published: July 1, 2023

Plankton phototrophy consumes CO2, increasing seawater pH, while heterotrophy does the converse. Elevation of pH (>8.5) during coastal blooms becomes increasingly deleterious for plankton. Mixoplankton, which can be important bloom-formers, engage in both photoautotrophy and phagoheterotrophy; theory, this activity could create a relatively stable environment plankton growth. Using systems biology modelling approach, we explored whether different mixoplankton functional groups modulate environmental compared to extreme activities phototrophic phytoplankton heterotrophic zooplankton. Activities by most do not stabilize pH. Through access additional nutrient streams from internal recycling with phagotrophy, is enhanced, elevating pH; especially so constitutive plastidic specialist non-constitutive mixoplankton. Mixoplankton exceed size blooms; synergisms physiology, accessing nutrition via phagotrophy as well inorganic sources, enhance or augment primary production rather than depressing it. Ocean acidification will thus enable larger form before basification detrimental. The dynamics such bloom developments depend on are consuming heterotrophs and/or phototrophs how community succession evolves.

Language: Английский

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